<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/1.png" class="header-img" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="iscollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>

        <!-- 侧边栏菜单区域 -->
        <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" unique-opened :collapse="iscollapse" :collapse-transition="false"
        router :default-active="activePath">
          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconsObj[item.id]"></i>
              <!-- 文本 -->
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item :index="'/'+subItem.path + ''" v-for="subItem in item.children" :key = 'subItem.id' @click="saveNavState('/'+subItem.path)">
              <template slot="title">
              <!-- 图标 -->
              <i class="el-icon-menu"></i>
              <!-- 文本 -->
              <span>{{subItem.authName}}</span>
            </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>

      <!-- 右侧内容主体 -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return{
      // 左侧菜单数据
      menulist : [],
      iconsObj:{
        '125':'iconfont icon-yonghuguanli',
        '103':'iconfont icon-quanxianguanli',
        '101':'iconfont icon-shangpinguanli',
        '102':'iconfont icon-dingdanguanli',
        '145':'iconfont icon-shujutongji'
      },
      // 是否折叠
      iscollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      // 清空token
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList(){
      const {data : res} =  await this.$http.get('menus')
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    // 点击按钮，切换菜单的展开与折叠
    toggleCollapse(){
      this.iscollapse = !this.iscollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath),
      this.activePath = activePath
    }
  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  // 嵌套，纵向上实现电商后台系统的对齐
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.header-img {
  width: 64px;
  height: 58px;
}
.el-aside {
  background-color: #333744;
    .el-menu{
      border-right:none ;
  }
}
.el-main {
  background-color: #eaedf1;

}

.iconfont{
  margin-right: 10px;
}

.toggle-button{
  background-color: #4A5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  // 光标实现:一只手
  cursor: pointer;
}
</style>